Johnson Controls LN Series, LN-VAVCFS-1, LN-VVTLFS-1, LN-VAVLFS-1 Installation Instructions Manual

LN Series Compact VAV Controllers

Installation Instructions

LN-VAVLFS-1, LN-VVTLFS-1, LN-VAVCFS-1

Code No. LIT-12011318

Release 4.1

Issued October 6, 2008

Supersedes November 9, 2007

Application

The LN Series Compact Variable Air Volume (VAV)
controller line is designed to meet the requirements of
single duct VAV or Variable Volume according to
Temperature (VVT) applications. You can directly
control a combination of up to two pieces of equipment
such as baseboards, duct heating/cooling, multi-stage
heaters, fans, valves, and lights. The LN Series
Compact VAV controllers are compatible with a wide
range of sensors and peripheral equipment.

The controllers are based on L
for peer-to-peer communication be tween controllers
and are L

ONMARK® network certified.

ONWORKS® technology

North American Emissions Compliance

United States

Compliance Statement (Part 15.19)

This device complies with Part 15 of the FCC Rules.
Operation is subject to the following two conditions:

1. This device may not cause harmful interference, and

2. This device must accept any interference received,
including interference that may cause undesired
operation.

Warning (Part 15.21)

Changes or modifications not expressly approved by the
party responsible for compliance could void the user’s
authority to operate the equipment.

Canada

This Class (A) digital apparatus meets all the
requirements of the Canadian Interference-Causing
Equipment Regulations.

Industry Canada Statement

Le terme « IC » précédant le numéro d'accréditation/
inscription signifie simplement que le produit est conforme
aux spécifications techniques d'Industry Canada.

Installation

For proper installation and subsequent opera tion of the
LN Compact VAV/VVT controllers, follow these
recommendations:

• Upon unpacking your controller, inspect the
contents of the carton for shipping damage. Do not
install damaged devices.

• Allow for proper clearance of device casing, wiring
terminals, and service pin for easy access,
hardware configuration, and maintenance. Record
the Neuron® ID located on top of the device; you
need it for commissioning the device.

• Operate the controllers under the following
conditions:

- Ambient temperature between 32 to 158°F

(0 to 70°C)

- Relative humidity from 0 to 95%,

noncondensing

• Ensure proper ventilation of devices, and avoid
areas where corroding, deteriorating, or explosive
vapors, fumes, or gasses may be present.

IMPORTANT: Work in a static-free area. Discharge
any static electricity you may have accumulated.
Discharge static electricity by touching a known,
securely grounded object. Do not handle the
controller without proper protection against static
discharge. Use a wrist strap when handling the
controller. Secure the wrist strap clamp to earth
ground.

LN Series Compact VAV Controllers Installation Instructions 1

Dimensions

Figure 2: Controller Components

Mounting

Figure 1: LN Series Compact VAV Controller

Dimensions

Location Considerations

The LN Compact V AV/VVT controllers are designed for
easy installation. The integrated mounting brackets on
each controller have a diameter of 0.2 in. (5 mm) and
are designed to oppose the shaft torque.

Note: Units with a damper actuator only have one
screw.

To mount the controller:

1. Mount the device directly on an air duct or in a
panel by using the integrated damper brackets and
screws.

2. Remove the terminal blocks, and use the controller
mounting slots to mark the location of any holes to
drill.

3. Remove the device and drill holes.

4. Clean the perforated surface, and fasten the
device using the appropriate screw types.

5. Ensure the damper shaft is at least 1 .5 in. (40 mm)
so the damper bracket can fit securely around the
damper shaft. If required, limit the maximum
damper shaft rotation by modifying the position of
the stroke end-stops in 5° increments.

LN Series Compact VAV Controllers Installation Instructions2

Note: To connect the high- and low-pressure sensors
(see Figure 3), use flexible tubes with a 1/4 in.
(6.4 mm) external diameter and 5/32 in. (4 mm) internal
diameter.

• Keep analog type cables (for power, voltage,
current inputs, or triac outputs) apart from other
types of wiring to avoid any ambient noise
transmission among wires; however, unswitched
power wiring can be in the same conduit as the
L

ONWORKS communication cable.

min . 40 mm (1.5 ")

Figure 3: Mounting a VAV or VVT Device on a

Damper Shaft

Wiring

IMPORTANT: Make all wiring connections in

accordance with the National Electrical Code and all
local regulations. User copper conductors only. Do
not exceed the control’s electrical rating.

CAUTION: Risk of Electric Shock.

Disconnect power supply before making

!

Recommendations

• Use the removable terminal connectors to make all
wiring connections.

• Disconnect the terminal connectors from the
device for wiring.

• Use a small, flat screwdriver to tighten the terminal
connector screws after inserting the wires.

electrical connections to avoid electric
shock.

The board connectors accept wires or flat cables
ranging from 22 to 12 AWG (0.645 to 2.052 mm
diameter) per pole; however, power cables must
remain between 18 and 14 AWG (1.024 to 1.628 mm
diameter).

Note: The transformer powering the controller must
be configured as a floating transformer. Do not ground
the transformer.

IMPORTANT: Do not connect the analog/digital
inputs or common terminals to the ground (only if
otherwise stated).

Power Wiring

Device power requirements: 24 VAC ±15%, Class 2
Note: To conform to Class 2 requirements in the

United States, use tran sformers of 100 VA or less to
power the controller.

For power and ground wiring, use the heaviest gauge
wire based on a maximum of 14 AWG and a minimum
of 18 AWG.

If powering more than one device, use the following
methods to calculate the power requirements of the
required transformer:

1. Add up the maximum power consumption of all
devices, and multiply this sum by 1.3.

2. If the resulting number is higher than 100 VA,
consider using multiple transformers.

Use an external fuse on the 24 VAC side (secondary
side) of the transformer to protect all devices against
power line spikes (Figure 4).

Maintain consistent polarity when connecting
controllers and devices to the transformer. Connect the
COM of each controller and each peripheral to the
same terminal on the secondary side of the
transformer.

LN Series Compact VAV Controllers Installation Instructions 3